package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    @Override
    public void updateEmployee(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }

    @Override
    public Employee getEmployeeById(Long id) {
        Employee employee = employeeMapper.getEmpById(id);
        employee.setPassword("****");
        return employee;
    }

    @Override
    public void startOrStop(Integer status, Long id) {
       //update emp set status = #{status} where id = #{id}
        Employee employee = new Employee();
        employee.setId(id);
        employee.setStatus(status);

        employeeMapper.update(employee);
    }

    @Override
    public void save(EmployeeDTO employeeDTO) {
        System.out.println("当前线程的ID是："+Thread.currentThread().getId());
        Employee employee = new Employee();

        //对象属性拷贝
        BeanUtils.copyProperties(employeeDTO, employee);

        //设置账号的状态，默认正常状态1表示正常，0标识锁定
        employee.setStatus(StatusConstant.ENABLE);

        //设置默认密码，默认密码123456
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        //设置当前记录的创建时间和更新时间
    /*    employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());*/

        //设置当前记录创建人id和修改人id
        employee.setCreateUser(BaseContext.getCurrentId());
        employee.setUpdateUser(BaseContext.getCurrentId());

        employeeMapper.insert(employee);
    }

    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        /**
         * 要看懂分页查询具体怎么实现的，首先要会不使用插件怎么去实现，然后再看黑马javaweb里面的使用插件实现的步骤
         * 开始分析分页查询原理
         * 首先是前端传送      当前页码:page和每页总记录数：PageSize
         * 而后端返回         数据列表：List和当前记录数：total
         * 总记录数total：select count(*) from employee
         * 数据列表List：select * from employee from limit (起始索引，每页记录数)
         * 起始索引（计算公式）：（当前页码数 - 1）*每页记录数
         */
        //select * from employee limit 0,10
        //开始分页查询,
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());
        //这里是两步并为一步了，首先是第一步查询所有员工，第二步是强制转换为Page类型
        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);
        //封装好的page里卖有total，这个参数是员工的记录总数
        long total = page.getTotal();
        //page里面还有封装好的result，这一页所有的记录数
        List<Employee> result = page.getResult();//返回的是一页的数据

        return new PageResult(total,result);
    }

    /**
     * 员工登录
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

}
